A)
B) under the law, Any vote may be challenged for a valid cause by any observer before
the voter has deposited his vote in the ballot box. (b) If a ballot is challenged on valid
grounds, the Representation Officer shall segregate it from the unchallenged ballots and
seal it in an envelope. The Representation Officer shall indicate on the envelope the
name of the challenger and the ground of the challenge. Thus, when an election which
provides for three (3) or more choices results in no choice receiving a majority of the
valid votes cast, and no objections or challenges have been presented which if sustained
might change the results, the representation officer shall motu proprio conduct a run-off
election within five (5) calendar days from the close of the election between the labor
unions receiving the two highest number of votes; Provided, that the total number of
votes for all contending unions is at least fifty (50%) percent of the number of votes cast.